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@feld @SlicerDicer @olmitch there couldn't possibly be an interplay of forces
> The historical record of large volcanic eruptions from 1500 to 1980, as contained in two recent eruption catalogs, is subjected to detailed time series analysis. Two weak, but probably statistically significant, periodicities of ∼11 and ∼80 years are detected. Both cycles appear to correlate with well-known cycles of solar activity; the phasing is such that the frequency of volcanic eruptions increases (decreases) slightly around the times of solar minimum (maximum).
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/JB094iB12p17371